Bollistg railway-chair



J. H.- SWETT.

Making Raflroad Chairs.

Patefited Aug. 31,1358.

' one jaw.

view of a bar, as heretofore rolled, before JAMES H. SIVETT, O F PITTSBURG, PENNSYLVANIA.

I ROLLING RAILWAY-CHAIR.

Specification of Letters Patent No. 21,380, dated August 31, 1858.

To all whom it may concern:

Be it known that I, JAMES H. Swn'rr, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in the Method of Rolling Railroad-Chairs; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, which illustrate the invention, and in which- Figure 1, represents a longitudinal vertical section through a pair of rolls, and showing in red lines the positions, and shape of the bar in the process of reduction and formation. Fig. 2, represents a section or end view of one of the finished chairs with Fig. 3, represents a similar end the lip or jaw is bent over a former to bring it into shape and position.

It has been invariably the practice heretofore in rolling railroad chairs, to raise up the portion that is to make the jaw, as seen at A, Fig. 3, and then to bend down said part over a former. Now this plan is objeotionable, for several reasons. In the first place, it requires a quality of iron that is expensive, for any other than the best, will not stand the bending down of thejaw from such a vertical position. Secondly, the portion A, of the bar, cannot be gripped hard between the rolls, for if so, it would not follow the bar through them, and its formation depends entirely upon its following the bar, and not upon its being wrought between the rolls, for this cannot be done it must pass through loosely, or not at all. Third, that with the best of iron, the bending down of the jaw injures the fiber of the metal, and weakens the chair, in its most important part, and where it endures its greatest strain. I do not raise up the portion that forms the jaw any higher than it is in its finished state, and consequently do not have to bend down any part or portion of it; and on this account have a stronger jaw, out of less expensive metal, than by the process heretofore universally practiced.

The nature of my invention consists in cutting under, or into the solid iron for the purpose of forming the jaw, after the bar is. rolled and bent into proper form, and thus avoid the raising up, and afterward bending down ofthat part or portion which is to constitute the jaw of the chair.

To enable others skilled in the art to make and use my invention, I will proceed to describe the same with reference to the drawings, which represent the formation of a chair with one jaw, but two jaws may be rolled on quite'as readily it being only necessary to put a little more bend in the sole of the chair so that a jaw, instead of a shoulder, will clear the rolls.

C, represents a tongue, and B, a grooved roller, hung in a suitable frame, and working together in the ordinary well known manner. I have represented five passes 1, 2, 3, 4, 5, between these rollsmore or less may be used, but it is with those 4, 5, that I shall mainly confine my description, as the others are mere reducers and shapers. When the bar goes through the 4th pass, it is bent as shown at a, in Fig. 1; it is then turned on its edge, and run through pass 5 where the tongue or collar 0, cutsinto, or under the part or portion 6, that is to constitute the jaw, and brings it into proper posit-ion and form. It will be thus seen that the point f, of the finished bar or chair, is at no time during the whole process, higher from the base 9, than it is when finished, and consequently no bending is necessary. A very slight bending might be done, with a view of attempting to evade my process, but all such attempts would be obvious in their import, the bending need not be done. Instead of the pass 5, being on the same pair of rolls with the others, they may be separated therefrom and I so prefer them. After the jaw or jaws are formed on the chairs or bar, it is then passed fiatwise between a pair of rolls to take the bend out of the base. Or instead of bending the bar, the same effect may be produced by skewing the pass, which in effect would amount to removing the collar from the shoulder or jaw of the chair, instead of said shoulder and aw from the collarI prefer the bending of the bar-though would claim its equivalent as involved in my invention.

Having thus fully described the nature and object of my invention I would state that I am aware that, the portion of the metal that is to form the jaw or jaws, has heretofore been raised up, and then bent down into proper position-this injures the fiber of the metal, and makes a bad chairI raising up and afterward bending down of do not claim any such method, but the part that is to form the aw as hereto- 10 What I claim herein as new and desire to fore done.

secure by Letters Patent is,

In the process of rolling railroad chairs, i JAMES SWETT Witnesses the cutting under or into the solid iron for A. B. SToUGH'roN,

the purpose of forming the jaw, after the bar is rolled and bent, and thus avoid the THOS. H. UPPERMAN. 

